Yes, a router can work with fiber optic internet. The router connects to a fiber optic modem or Optical. This conversion happens either through an Optical Network Terminal (ONT) or directly via specialized router ports. The critical factor is not the *type* of internet coming. As far as I understand this particulate model is fiber compatible, but my ISP insists I need an adapter even though they're offering no more then 1,000mbps. It's very likely your particular ISP needs a media convertor which is probably what they're. This morning my ISP upgraded my Internet connection from a standard coaxial cable and Cisco modem to a fiber optic cable and Hitron modem Model Name NOVA-2004. Despite multiple attempts, the Archer AX6000 v1.
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